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TI-2026-34331 Aliases CVE-2026-46702GHSA-wwx6-x28x-8259

Russh: Post-decompression SSH packet size was not bounded, allowing remote oversized compressed packets

Priority HIGH 72CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

Russh is a Rust SSH client & server library. From version 0.34.0 to before version 0.61.1, when SSH compression is enabled, russh accepted compressed packets whose on-wire size passed the normal transport packet-length checks but whose decompressed size was much larger. This allowed a remote peer to send oversized post-decompression packets that should have been rejected. In current releases, this is a remote denial-of-service / resource-exhaustion issue in the post-decompression receive path. In older releases before 0.58.0, the same remote decompression path used CryptoVec, which appears to make the historical impact worse. This issue has been patched in version 0.61.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00268 19th percentileScored 2026-11-07
Fix Fixed russh (Eugeny): 0.61.1russh (crates.io): 0.61.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Eugenyrussh0.34.0 to before 0.61.10.61.1Patch availableCNA
—russh (crates.io)0.34.0 to before 0.61.10.61.1Patch availableGHSA-wwx6-x28x-8259
  • russh VendorEugeny Affected 0.34.0 to before 0.61.1 Fixed in 0.61.1 Patch available CNA
  • russh (crates.io) Vendor— Affected 0.34.0 to before 0.61.1 Fixed in 0.61.1 Patch available GHSA-wwx6-x28x-8259

Remediation

  • Fix · CNA russh (Eugeny) Fixed in 0.61.1
  • Fix · GHSA-wwx6-x28x-8259 russh (crates.io) Fixed in 0.61.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-46702
  2. 2026-10-03 Alias added: GHSA-wwx6-x28x-8259

References

Advisory 1

Other 2

  • TI-2026-65512 russh: Client-side channel-scoped Handler callbacks fire for channel IDs the client never opened CVSS 3.1HIGH 7.5
  • TI-2026-35550 Russh: SSH message fields were decoded through allocation-first parsers before field-specific bounds CVSS 3.1HIGH 7.5
  • TI-2026-34308 Resource allocation without limits in Eugeny russh CVSS 3.1HIGH 7.5
  • TI-2025-16084 Tabby has a TCC Bypass via Misconfigured Node Fuses CVSS 4.0HIGH 8.6
  • TI-2024-36991 Tabby has a TCC Bypass via Unnecessary Permissive Entitlements in Tabby CVSS 4.0HIGH 8.6
  • TI-2026-82122 Missing confirmation check in russh SSH agent for constrained keys CVSS 4.0HIGH 8.3
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences